"Star Dome" HOT NEWS!!! LOOK!
Posted 20 October 2005 - 08:39 AM
Posted 20 October 2005 - 08:47 AM
Posted 20 October 2005 - 09:01 AM
I wonder if it would be possible to have NO wheels on the dome, and use teflon pads instead, like we use on Dobsonian mounts. That might be too much, though...
Here's the URL to the post about the vinyl shed disaster:
gun4hire was the poster. Not a sight I'd want to see in MY backk yard!
Posted 20 October 2005 - 09:18 AM
Posted 20 October 2005 - 10:38 AM
Posted 20 October 2005 - 10:46 AM
Posted 20 October 2005 - 11:12 AM
Posted 20 October 2005 - 11:36 AM
Posted 20 October 2005 - 11:37 AM
Posted 20 October 2005 - 12:46 PM
Posted 20 October 2005 - 01:31 PM
Posted 20 October 2005 - 04:17 PM
Ken's idea could be expanded to include some hold-down rollers adjacent to the side rollers, that would roll on the underside of the wall lip, to prevent wind from lifting the dome off the walls.
Larger diameter wheels will roll easier than smaller roller bearings.
I hope this takes off and becomes a permanent part of their product line. I'd love to have one, but it will be a good while before I have a place to put one.
Posted 20 October 2005 - 04:30 PM
Posted 20 October 2005 - 04:51 PM
Posted 20 October 2005 - 05:01 PM
Posted 20 October 2005 - 05:48 PM
The base lip and dome lip would probably need to be reinforced. Possibly makeing it double thick, or just adding blocking under it so you can bolt the rollers on. The dome may be light, but with a lot of use, and the stress of the wind load, the lip may become weakened.
One thing to remember to send to dan is to make sure the "Vertical Lip" on the dome is deep enough to accomodate the modification for the "hold down" rollers... Figure a 3 inch roller on the top, another under the lip mounted to a block on the dome lip... You think 6-8 inches for the dome lip should suffice?
Posted 20 October 2005 - 06:39 PM
Posted 20 October 2005 - 07:05 PM
I also plan to incorporate some type of rigid "hold down" clamps or metal carriage bolts to securely hold down the dome when not in use. Let's face it. We're not going to be out observing under this dome in moderate, blowing and gusting winds. I know I won't. Light winds yes. So the best thing to do when not using this observatory dome is to securely fasten it down with some strong rigid clamps of some sort. I remember all to well seeing my old lighweight "square dome" of the Rickman Observatory in a twisted, splintered, shattered heap on the ground as the end results of becoming a "UFO" sometime in the night while I was sleeping . This WILL NOT happen again in my backyard.
Posted 20 October 2005 - 07:29 PM
Rick: what is the height of the lower section? I see the weight is 150#. Thanks for all your work getting this going!
csa/montana, I don't see a wall height either on Dan's drawing. But if it is anything close to scale, I would venture a guess of 48", or just slightly taller than the dome height. I myself am not interested in the plastic base. I prefer to construct my own base instead. I can ask Dan in my next email if you wish. The pleasure is mine in helping making this dome a reality. The ASTRO community needs a dome at a "down-to-earth price". We'll soon have one. Maybe the handful of companies out there now that manufacture domes will drop their prices some, as I would hope the 8' Star Dome will steal a good portion of their business.
Posted 20 October 2005 - 08:00 PM
Posted 20 October 2005 - 08:26 PM
I'd like mine with the 3 inch lip and 6 inch skirt. The attachment method you show might be a good one, as an option. I THINK the idea here is to get a Polydome in the shape of a dome instead of the calf shelter shape and THEN figure a way to mount it. I don't want to be tied to purchasing any one particular mounting method. (my 2 cents)
Understood Steve and agreed. The base lip/skirt ring area needs to be something everyone will be able to work with on their own.
Posted 20 October 2005 - 08:40 PM
Yeah, you've got it! I'm sure Dan'll appreciate the simplicity of your design, and we all can benefit from the ease of manufacture when our domes cost less (because they cost less to make). I agree that the rollers need to be larger to make them turn more easily. The horizontal wheels on the outside will block the dome from lifting off in a wind, and they can be installed AFTER the dome is placed on the walls (you show the bolts holding it in place in your graphic).
I too saw the 3-sided channel of Rick's design as tricky. I could see that there was no way to get the wheel into the thing. It would also be a tricky thing to manufacture, driving the cost up.
This is coming together nicely. Ken, could you e-mail your design to Dan? He'll appreciate the thought, and will notice the intense interest that the StarDome is attracting.
I want one! I want one! I want one!
Posted 20 October 2005 - 09:26 PM
Support "Spurs" around the opening would be a great addition for added strength.
As for the lips, I belive the 6" skirt may work... but the lip may need to be slightly larger... All depends on the lip on the base. If the base lip is less than 3 inches, mounting even a Garage door roller would be tough. A 3 inch lip on the base would be fine, but for the dome, it should probably be more like a quarter inch larger.???
As for people using different roller methods, the whole Idea here is being "Cheap" (Or rather "Low Cost"). And with the dome being light-weight, a heavy duty roller/caster assembly would be overkill.
One more thought... On the dome. The "Lip/Skirt"... What about making that "Lip" go both outside, and INSIDE about 3 inches as well? This would accomodate the adding of a motor unit, using that track to run the motor wheel on to turn the dome?... (I need to draw something) Did I loose anyone?